National Weather Service Issues Extreme Heat Warning

Tue Aug 19 13:37:00 PDT 2025

Get tips to keep yourself and others safe during excessive heat.

The Los Angeles County Department of Public Health urges residents to take precautions to avoid heat-related illness such as heat exhaustion, heat stroke and heat cramps, as high temperatures are forecast to impact the region this week.

The National Weather Service (NWS) has issued an Extreme Heat Warning and Heat Advisory as high temperatures have been forecasted for the following areas:

Extreme Heat Warning

  • Los Angeles Inland Coast: Thursday, August 21 through Friday, August 22.
  • East Santa Monica Mountains: Thursday, August 21 through Friday, August 22.
  • Santa Clarita Valley: Thursday, August 21 through Saturday, August 23.
  • Western Santa Monica Mountains: Thursday, August 21 through Saturday, August 23.
  • Calabasas/Agoura Hills: Thursday, August 21 through Saturday, August 23.
  • Western San Fernando Valley: Thursday, August 21 through Saturday, August 23.
  • Eastern San Fernando Valley: Thursday, August 21 through Saturday, August 23.
  • Santa Susana Mountains: Thursday, August 21 through Saturday, August 23.
  • Western San Gabriel Mountains/Hwy 14 Corridor: Thursday, August 21 through Saturday, August 23
  • Antelope Valley: Thursday, August 21 through Saturday, August 23
  • San Gabriel Valley: Thursday, August 21 through Saturday, August 23
  • East San Gabriel Mountains: Thursday, August 21 through Saturday, August 23
  • Western Antelope Valley: Thursday, August 21 through Saturday, August 23
  • Eastern Antelope Valley: Thursday, August 21 through Saturday, August 23
  • Northwest LA County Mountains: Thursday, August 21 through Saturday, August 23

Heat Advisory

  • Palos Verdes Hills: Friday, August 22

Additionally, the California Governor’s Office of Emergency Services (Cal OES) approved the predeployment of firefighting resources in Los Angeles County in response to elevated heat and critical fire weather conditions forecasted to impact Southern California starting this Wednesday and lasting through Saturday. View the Governor’s website for more details.

The L.A. County Department of Public Health recommends the following tips to keep yourself and others safe during excessive heat:

· Drink plenty of water and keep hydrated throughout the day

· If you must go out, plan your day to avoid going out during the hottest hours and wear sunscreen (SPF 15)

· Wear lightweight, light-colored clothes and wear a hat or use an umbrella

· Cars get very hot inside, even if the windows are ‘cracked’ or open. Never leave children or pets alone in cars. Call 911 if you see a child or pet in a car alone

· Check on those at risk for heat-related illness, like those who are sick or have chronic conditions, older adults, pregnant women, children, those who live alone, pets and outdoor workers and athletes

If you don’t have air conditioning, follow these tips:

· Stay hydrated and don’t wait until you’re thirsty to drink water

· Take cool showers or baths

· Use your stove and oven less to avoid making your home hotter

· Visit a library, cooling center, shopping mall or other air-conditioned space. If you need help finding a cool space, call 211.

View the advisory for additional information or visit LACOE's website.